/*
 * Copyright 2011 Philippe Blanc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package me.l1k3.fx.client.channel;

import com.google.gwt.dom.client.Element;

import me.l1k3.core.client.Core;
import me.l1k3.fx.client.channel.inter.Channel;
import me.l1k3.fx.client.channel.inter.ChannelContext;

public class ShowAndHideChannel implements Channel {
    protected boolean forward;
    
    protected ShowAndHideChannel(boolean backward) {
        this.forward = backward;
    }
    
    //- - - factory
    
    public final static ShowAndHideChannel hideAndShow() {
        return new ShowAndHideChannel(false);
    }
    
    public final static ShowAndHideChannel hideAndShow(boolean backward) {
        return new ShowAndHideChannel(!backward);
    }
    
    public final static ShowAndHideChannel hideAndShow(Element element) {
        return new ShowAndHideChannel(!(Core.getComputedStyleProperty(element, "visibility").equals("hidden") || Core.getComputedStyleProperty(element, "display").equals("none")));
    }
    
    //- - -
    
    @Override
    public void init(ChannelContext context) {
        context.enableShowAndHide();
        context.setVisible(forward);
    }
    
    @Override
    public boolean isForward() {
        return forward;
    }
    
    @Override
    public void toggle(ChannelContext context) {
        forward = !forward;
        context.setVisible(forward);
    }
    
    @Override
    public void start(ChannelContext context) { }

    @Override
    public void update(ChannelContext context) { }

    @Override
    public void complete(ChannelContext context) {
        toggle(context);
    }
}
